It is Artful... Sorry!
brill@tapir:~$ dpkg -l | grep ecrypt ii ecryptfs-utils 111-0ubuntu4 amd64 ecryptfs cryptographic filesystem (utilities) ii libecryptfs1 111-0ubuntu4 amd64 ecryptfs cryptographic filesystem (library)
brill@tapir:~$ uname -a Linux tapir 4.13.0-11-generic #12-Ubuntu SMP Tue Sep 12 16:03:57 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
It is Artful... Sorry!
brill@tapir:~$ dpkg -l | grep ecrypt
ii ecryptfs-utils 111-0ubuntu4 amd64 ecryptfs cryptographic filesystem (utilities)
ii libecryptfs1 111-0ubuntu4 amd64 ecryptfs cryptographic filesystem (library)
brill@tapir:~$ uname -a
Linux tapir 4.13.0-11-generic #12-Ubuntu SMP Tue Sep 12 16:03:57 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux